共查询到19条相似文献,搜索用时 390 毫秒
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利用聚乙二醇二缩水甘油醚(PEGDE)化学交联丝素蛋白(SF)、以CaCl_2交联海藻酸钠(SA),采用分步交联的方法制备了SF/SA双网络型复合纤维,通过DV-C型数显黏度计、FTIR、XRD、电子单纤维强力仪、核磁共振变温弛豫分析仪、SEM等对纺丝溶液表观黏度和交联改性SF/SA复合纤维的结构性能进行了表征,研究了交联剂PEGDE添加量对纺丝溶液的表观黏度和交联改性SF/SA复合纤维的力学性能、交联度、微观形貌、吸湿性能和保湿性能等的影响。结果表明,随着PEGDE含量的增加,纺丝溶液的表观黏度呈先下降后增加的趋势,加入适量的交联剂可以降低纺丝溶液的表观黏度,增加纤维的可纺性;纤维的断裂强度、断裂伸长率和交联度呈先增加后减少的趋势,PEGDE与SF的质量比为3∶1时,交联改性SF/SA复合纤维的断裂强度和交联度达到最大值,分别为2.34cN/dTex和55.38%;交联改性SF/SA复合纤维的交联度越大,纤维表面沟槽结构越密集,纤维内部结构越紧密均匀,SF与SA的相容性越好;交联改性后,SF/SA复合纤维吸湿性能和保湿性能得到提高,吸湿平衡时间提前。 相似文献
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以海藻酸钠(SA)和磷钨酸(PTA)为原料,通过溶液浇铸法制备了不同配比的海藻酸钠/磷钨酸(SA/PTA)杂化膜。用傅立叶红外分析(FT-IR)、扫描电子显微镜(SEM)、热失重(TGA)等手段对杂化膜进行了表征与分析,并考察了SA/PTA杂化膜的力学性能。结果表明:SA与PTA有着较好的相容性,能够制备出致密无缺陷的杂化膜,但当PTA含量超过8wt%时,膜在微观上出现相分离;PTA的加入,极大地提高了杂化膜的耐热性和机械强度。膜的拉伸强度从纯SA膜的19.72MPa增加到了65.17MPa,断裂伸长率略微下降。 相似文献
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采用水溶液法制备了钠化累托石(Na+REC)与海藻酸钠(SA)插层纳米复合膜(Na+REC/SA)。以红外光谱(IR)、X射线衍射(XRD)分析了复合膜的分子结构,通过电镜扫描(SEM)及原子力显微镜(AFM)观察了复合膜的相貌结构,研究了复合膜的热性能及力学性能。结果表明,Na+REC在添加量较少时可与SA形成插层型纳米复合膜,该复合膜与纯SA膜相比,具有较高的拉伸强度、断裂伸长率及热稳定性。在Na+REC添加2%时,复合膜的拉伸强度、断裂伸长率及热稳定性最高,与纯SA膜相比,拉伸强度提高58.7%,断裂伸长率提高100%,10%失重率时对应的热分解温度提高了115℃,40%失重率时提高了185℃。 相似文献
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目的以壳聚糖-淀粉复合膜为研究对象,加入不同质量分数的甘油作为增塑剂,研究甘油对复合膜性能产生的影响。方法将壳聚糖溶液和玉米淀粉溶液以6∶4的体积比混合,再添加一定量甘油,流延成膜,利用万能试验机测定膜的力学性能,用扫描电镜观察膜的形貌特征,并对膜进行红外扫描和X-衍射分析。结果甘油与淀粉壳聚糖具有良好的相容性,当甘油质量分数为35%~55%时,随着甘油含量的增加,膜的抗拉强度下降,断裂伸长率增加,抗拉强度最高可达33.57 MPa,断裂伸长率最高可达80.39%。结论甘油作为一种增塑剂,能够改善膜的力学性能,为可食性膜的广泛应用提供了可能性。 相似文献
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聚乙二醇丙三醇对丝素蛋白膜的改性 总被引:2,自引:0,他引:2
以乙二醇和环氧氯丙烷为原料,合成了一种新的高分子化合物:聚乙二醇丙三醇(PEGG),用红外光谱和核磁共振对其进行了表征。用流延法制备了丝素蛋白/PEGG共混膜,用X射线衍射法,红外光谱法对共混膜的结构进行测试分析,结果表明,随着PEGG含量的增加,丝素蛋白(SF)的结晶度有所下降,PEGG与丝素蛋白之间有氢键结合,因此可能抑制了s ilkⅠ结晶。测试了共混膜的力学性能,结果表明,共混膜的断裂伸长率、弹性随着PEGG含量的增加而增大,共混膜的断裂强度均高于24M Pa,而杨氏模量都小于80 M Pa。SF/PEGG共混膜具有良好的柔软性和弹性。 相似文献
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聚乙烯醇/海藻酸钠复合膜性能的正交优化 总被引:1,自引:1,他引:0
目的提高海藻酸钠/聚乙烯醇复合膜的断裂伸长率。方法利用溶液流延制备系列复合薄膜,采用正交设计方法研究海藻酸钠和聚乙烯醇的质量比、甘油用量和Zn O用量等3个因素对复合膜拉伸强度和断裂伸长率及其他性能的影响。结果甘油用量显著影响海藻酸钠/聚乙烯醇复合膜的断裂伸长率,其影响程度高于其他2个因素;Zn O和甘油的加入使得复合膜的拉伸强度显著降低。结论采用正交设计方法有利于研究各因素对复合膜物理性能的影响,为进一步的复合膜研究提供参考。 相似文献
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聚乳酸-乙醇酸共聚物/丝素共混纳米纤维多孔膜的制备及性能 总被引:1,自引:0,他引:1
以六氟异丙醇(HFIP)为共溶剂,通过静电纺丝法制备了聚乳酸-乙醇酸共聚物(PLGA)/丝素(SF)共混纳米纤维多孔膜。用场发射扫描电镜(FE-SEM)、傅立叶红外光谱分析仪(FT-IR)、多功能拉伸仪、液滴形状分析仪对共混纤维多孔膜的形貌、分子结构、力学性能及亲水性进行测试。结果表明,共混多孔膜中随SF的加入纤维直径... 相似文献
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A novel electrospinning of silk fibroin/hydroxyapatite hybrid nanofibers with different composition ratios was performed with methanoic acid as a spinning solvent. The silk fibroin/hydroxyapatite hybrids containing up to 30% hydroxyapatite nanoparticles could be electrospun into the continuous fibrous structure. The electrospun silk fibroin/hydroxyapatite hybrid nanofibers showed bigger diameter and wider diameter distribution than pure silk fibroin nanofibers, and the average diameter gradually increased from 95 to 582 nm. At the same time, the secondary structure of silk fibroin/hydroxyapatite nanofibers was characterized by X-ray diffraction, Fourier transform infrared analysis, and DSC measurement. Comparing with the pure silk fibroin nanofibers, the crystal structure of silk fibroin was mainly amorphous structure in the hybrid nanofibers. X-ray diffraction results demonstrated the hydroxyapatite crystalline nature remained as evidenced from the diffraction planes (002), (211), (300), and (202) of the hydroxyapatite crystallites, which was also confirmed by Fourier transform infrared analysis. The thermal behavior of hybrid nanofibers exhibited the endothermic peak of moisture evaporation ranging from 86 to 113 °C, and the degradation peak at 286 °C appeared. The SF/HAp nanofibers mats containing 30% HAp nanoparticles showed higher breaking tenacity and extension at break for 1.1688 ± 0.0398 MPa and 6.55 ± 1.95%, respectively. Therefore, the electrospun silk fibroin/hydroxyapatite hybrid nanofibers should be provided potentially useful options for the fabrication of biomaterial scaffolds for bone tissue engineering. 相似文献
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This study reports drug-loaded silk sericin (SS)/silk fibroin (SF) blend microparticles being fabricated by the water-in-oil emulsion solvent diffusion of a SS/SF aqueous blend solution. Blue dextran was used as the water-soluble drug model. The influence of the SS/SF blend ratio on the characteristics and drug release behavior of the blend microparticles was investigated. The blend microparticles were analyzed by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and UV-vis spectroscopy. The blend microparticles were nearly spherical in shape as determined from SEM micrographs. The FTIR and TG results demonstrated that interactions between SS and SF molecules had occurred. The blend microparticles showed very high drug loading efficiency (94–98%) for all blend ratios. The in vitro drug release significantly decreased with decreasing SS blend ratio. The results demonstrated that the SS/SF blend microparticles could be used as biocompatible and biodegradable microparticles for controlled release drug delivery applications. 相似文献
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以二茂铁作为交联催化中心对海藻酸钠阳膜进行改性,制备了mSA-mCS聚合物双极膜.测定了双极膜的红外光谱、海藻酸钠(SA)和壳聚糖(CS)电荷密度、OH-渗透性、I-V工作曲线及交流阻抗.OH-渗透性和膜交流阻抗的测试结果表明,mSA-mCS双极膜经二茂铁离子改性后,双极膜中间层中水解离的性能得到了提高,同时降低了膜阻... 相似文献
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将柔性链聚乙烯醇(PVA)分别与刚性链天然高分子海藻酸钠(SA)和壳聚糖(CS)共混,以增强其柔韧性及双极膜界面层的相容性。然后分别以纳米无机半导体材料和戊二醛为交联剂,对PVA/SA和PVA/CS进行改性,制备了PVA-mSA/mCS双极膜。测定了双极膜的J-V曲线、膜阻抗、接触角和溶胀度。以扫描电镜对PVA-ZnO-SA/mCS膜成分与形貌作表征,膜厚约121μm,中间界面层厚约5μm。电子能谱图表明氧化锌均匀分布在阳膜层中。实验结果表明,采用纳米ZnO改性后双极膜的亲水性增强,具有更强的中间界面层水解离能力,较小的工作电压和较低的膜阻抗,可以广泛应用于绿色化学和环境治理。 相似文献
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The preparation of insoluble fibroin films induced by degummed fibroin or fibroin microspheres 总被引:1,自引:0,他引:1
Lv Q Cao C Zhang Y Man X Zhu H 《Journal of materials science. Materials in medicine》2004,15(11):1193-1197
Blending degummed fibroin (DF) or insoluble fibroin microspheres with concentrated fibroin solution, the insoluble films were obtained through drying the solution at 40–45 ∘C. The conformation of silk fibroin films was analyzed by infrared spectrum and X-ray diffractometry. The results demonstrated that β-sheet conformation increased rapidly when the degummed silk or insoluble microspheres blended with fibroin, while the pure SF membrane was mainly composed of α/random coil conformation when the other conditions kept same. This suggested that fibroin microspheres and degummed fibroin could induce the formation of β-sheet crystal and the insoluble films, without methanol after-treatment, could be obtained at approximately room temperature. Although the fibroin films blending with DF had many protuberances, the films containing fibroin microspheres had the smooth surface and could be used effectively in biotechnological materials and biomedical application. 相似文献
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《复合材料学报》2008,25(6):136-139
系统分析了羟基磷灰石(HA)的制备方法和丝素蛋白纤维(SF)的溶解方法,提出一种制备纳米丝素蛋白/羟基磷灰石生物复合材料(SF/HA)的新型反应复合方法——“一步法”。并对由“一步法”制得的SF/HA分别进行了钙磷比测定、红外光谱测试、透射电镜观察和X射线衍射测试。结果表明:SF/HA中的钙磷比是1.6692,与标准HA中的钙磷比1.67一致;SF/HA中同时含有SF和HA中各自的官能团;SF/HA的晶粒横向尺度小于100 nm,SF/HA呈针状或柱状晶粒, SF和HA能够形成复合; SF/HA的晶型属于六方晶系, 当SF在SF/HA中所占质量分数为10%时,晶胞参数a=b=9.0319 A,c=7.0148 A,沿c轴方向平均晶粒尺寸是230.7645 A。“一步法”制备SF/HA具有合理性和可行性。 相似文献